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Free Dictionary API vs OWASP API Security Project

Same instrument, two spec sheets — measured, not claimed.

APIFree Dictionary APINEW—OWASP API Security ProjectNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Dictionary API vs OWASP API Security Project: common questions

Which is more reliable, Free Dictionary API or OWASP API Security Project?

On our scheduled checks, OWASP API Security Project leads on measured uptime — Free Dictionary API at —% versus OWASP API Security Project at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Free Dictionary API and OWASP API Security Project need an API key?

Neither needs a paid key — Free Dictionary API is callable with no signup, and OWASP API Security Project is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Free Dictionary API and OWASP API Security Project from the browser?

Yes — both Free Dictionary API and OWASP API Security Project send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Free Dictionary API and OWASP API Security Project free for commercial use?

Free Dictionary API has unclear commercial terms, and OWASP API Security Project has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.